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Windows 7: BSOD after restart 0x0000007f

Short story, PC was fine then started to BSOD a few weeks back after each restart, not straight away but after a period. So I tried taking windows back to a previous restore point and all was fine until it started happening again. I went through a process of selective start up and thought I'd narrowed it down to a few things as I could now run my sysytem without the BSOD and most services were up and running. Well a couple of days ago, I couldn't access itunes (it just wouldn't open) so I rolled back my system again, iTunes was fine but this morning the BSOD is back.

I'm in a bit of a mess really and don't want the above to be a distraction but there might be something in there that helps.

#
# Copyright (c) 2007 F-Secure Corporation
#
# This is a HOSTS file created during malware removal.
#
# Your original HOSTS file was infected and it was replaced
# by this file containing only clean default entries.
# The original HOSTS file may be restored from the product's
# quarantine feature.
#
127.0.0.1 localhost
::1 localhost

Mark, was your system completed cleaned of malware? Did you perform a format and re-installtion after the malware infection?

OK so noy sure if this additional information helps but I managed to stop my PC blue screening using system configuration and the 50/50 principle of disabling and enabling batches to see if I could isolate the offending item. Well I've not managed to get it down to one thing but the system seems stable and BSOD for a long while if I disable;

From the link above - how to create a system Image backup in Windows 7

You cannot restore a 64-bit Windows 7 backup image on a 32-bit system.
You cannot restore a 64-bit Windows 7 backup image with a 32 bit Windows 7 installation DVD or recovery partition, or the other way around. You must use the same 32-bit or 64-bit Windows 7 installation DVD or recovery partition as the backup image is.

Reading this it seems to say that if I create a back up of mu current 32bit system I woun't be able to restore it to the new 64bit OS, unless I am misunderstanding or blending both points (?)

Also received this message (see attached zip) whilst looking into creating a system image. Probably to do with some of the disabled services but I'm not sure what to enable and also this is likely to start the whole BSOD process.

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